I would like to do a project with many op amp. I want to do it to educate myself, I need a project that challenge me a bit but something achievable for someone with intermediate experience. Does anyone have an interesting idea?.

Thanks in advance,
Winsu]]>19Quad DDS and Quad WaveDACSun, 17 May 2020 01:54:47 +0000https://www.edaboard.com/threads/quad-dds-and-quad-wavedac.390116/
https://www.edaboard.com/threads/quad-dds-and-quad-wavedac.390116/invalid@example.com (danadakk)danadakkI often have test generation problems where I need multiple Function
Generators capable of generating Sine, Ramp, Arbitrary , Square, and
synched to each other in some cases.

This is a single chip solution, each onchip DDS feeds a WaveDAC that
generate the desired waveform using DMA and lookup tables onchip.

The DDS are capable of FM as well if needed, and can be synched to
each other, depending on each respective frequency.

I use a $ 10 board for this, generally.

The DDS can be managed...

Quad DDS and Quad WaveDAC]]>0DIY Non Contact Hand Sanitizer Dispenser, without an Arduino or an MCUSat, 16 May 2020 16:35:21 +0000https://www.edaboard.com/threads/diy-non-contact-hand-sanitizer-dispenser-without-an-arduino-or-an-mcu.390105/
https://www.edaboard.com/threads/diy-non-contact-hand-sanitizer-dispenser-without-an-arduino-or-an-mcu.390105/invalid@example.com (Hesambook)HesambookAs we all know, the COVID-19 outbreak hit the world and changed our lifestyle. In this condition, Alcohol and hand sanitizers are vital fluids, however, they must be used properly. Touching alcohol containers or hand sanitizers with infected hands can spread the virus to the next person. In this article, we will build an automatic hand sanitizer dispenser that uses IR sensors to detect the presence of a hand and activates a pump to pour the liquid on the hand. The...

The board starts, sends data to backend (Node.js) and falls asleep for 5 minutes. To save battery power, the field effect transistor at pin D6 turns off the power to the BME280. The 18650 battery is controlled by input A0. If the battery voltage exceeds 4.2V, the D7 output breaks the battery charge circuit from the solar panel.

Design files at the bottom of the page. Click on vote for the PCB contest, if you like the design

I'm accepting any ideas for better USB to I2S...

USB DAC project - design files included]]>0How to Boost LM317 Output CurentSat, 14 Mar 2020 08:34:28 +0000https://www.edaboard.com/threads/how-to-boost-lm317-output-curent.389163/
https://www.edaboard.com/threads/how-to-boost-lm317-output-curent.389163/invalid@example.com (Hesambook)HesambookLM317 is one of the most popular adjustable regulator chips. The output voltage of the regulator can be adjusted from 1.25V to 35V. However, the chip can deliver currents up to 1.5A which is not enough for some power applications. In this article/video, I will discuss two methods of LM317 current boosting, using power PNP and NPN pass transistors.

The STM8S001J3 is an 8-bit microcontroller that offers 8 Kbytes of Flash program memory, plus an integrated true data EEPROM. It is referred to as a low-density device in the STM8S microcontroller family. This MCU offered in a small SO8N package. In this article, we are going to build a programmable Police LED Flasher device that can be used for vehicles...

Police LED Flasher Using an STM8 [36+36 LEDs]]]>1Electronic version of the German Enigma machineTue, 18 Feb 2020 07:02:05 +0000https://www.edaboard.com/threads/electronic-version-of-the-german-enigma-machine.388543/
https://www.edaboard.com/threads/electronic-version-of-the-german-enigma-machine.388543/invalid@example.com (Slawek_ps)Slawek_psHello to all forum Users

this project was created in homage to Polish mathematicians (Rejewski, Rozycki, Zygalski) who broke the code of the German Enigma machine. In July 1939, the Polish side invited representatives of the cryptological services of France and Great Britain transferred all knowledge about decrypting the Enigma code. Based on the information provided by the Polish side created by the British in 1939, Bletchley Park, enabled Alan Turing to "quickly enter" further work on...

A tiny DC to DC buck converter board is useful for many applications, especially if it could deliver currents up to 3A (2A continuously without heatsink). In this article, we will learn to build a small, efficient, and cheap buck converter circuit.

97% Efficient DC to DC Buck Converter [3A, Adjustable]]]>1DI-Mini Wi-Fi Module to AlexaTue, 19 Nov 2019 22:18:06 +0000https://www.edaboard.com/threads/di-mini-wi-fi-module-to-alexa.387700/
https://www.edaboard.com/threads/di-mini-wi-fi-module-to-alexa.387700/invalid@example.com (Lester268)Lester268Interfacing a D1-Mini Wi-Fi module to Alexa to switch items of your choice. In this video I design and build a PCB that houses a relay and the D1-Mini that is activated by Alexa.

Capable of measuring the capacity of almost any kind of battery (below 5V)

Easy to solder, build, and use, even for beginners (all components are Dip)

An LCD user interface

Specifications:

Board Supply: 7V to 9V(Max)

Battery Input: 0-5V(max) – no reverse polarity

Constant Current Load: 37mA to...

How to measure the battery capacity using Arduino-Nano [Lithium-NiMH-NiCd]]]>1LED TV backlight testerMon, 14 Oct 2019 15:56:00 +0000https://www.edaboard.com/threads/led-tv-backlight-tester.387095/
https://www.edaboard.com/threads/led-tv-backlight-tester.387095/invalid@example.com (john-nafp)john-nafpsome time ago i needed a portable power supply that could lit led arrays so i can test various tv sets brought to my repair shop,so i decided to built one.this little device works perfect for 2-3 years now and all the repairs im making is done with the help of it.
here is the schematic and various photos and below a video presentation on my youtube channel...

Switching power supplies are known for high efficiency. An adjustable voltage/current supply is an interesting tool, which can be used in many applications such as a Lithium-ion/Lead-acid/NiCD-NiMH battery charger or a standalone power supply. In this article, we will learn to build a variable step-down buck converter using the popular LM2576-Adj chip.

Article source...

A Variable Switching Power Supply using LM2576 [Buck Converter, CC-CV]]]>3PMOS load switch circuit issueWed, 25 Sep 2019 07:05:59 +0000https://www.edaboard.com/threads/pmos-load-switch-circuit-issue.386714/
https://www.edaboard.com/threads/pmos-load-switch-circuit-issue.386714/invalid@example.com (usama14)usama14Hi all. I'm working on a load switch circuit that drives a capacitive load of 1000uF and a GAN transistor in parallel. The schematic of the circuit is attached. The input voltage is 50V and the Pmos being used is IRF5210. The simulations show promising results(also catering the inrush currrent issue), but on the hardware, when the GAN is biased to -2.9V and the pulse is applied to the NPN transistor, the circuit turns on but draws the maximum current from the supply. Hence, the PMOS gets...

PMOS load switch circuit issue]]>10What do you think about this 3D model of PCB?Tue, 27 Aug 2019 09:55:55 +0000https://www.edaboard.com/threads/what-do-you-think-about-this-3d-model-of-pcb.386237/
https://www.edaboard.com/threads/what-do-you-think-about-this-3d-model-of-pcb.386237/invalid@example.com (James29391)James29391Thanks for everyone help me.:razz::razz::razz::razz:
Now my new project 3D model is done.
I build it with my teacher, and this project takes me a month to do it.
Hooo! Feel free to leave a comment.